As Russia delves the depths of the Black Sea in search of the crashed US drone, we take a look at what else might be lurking beneath the waves. From ancient shipwrecks to huge underwater rivers ...

Archaeologists believe they will soon solve the mystery regarding the ancient Greek city of Hadrianopolis which was suddenly abandoned.

The discovery reinforces the theory that Hadrianopolis was not only a cultural center but also a strategic military enclave ...

Official websites use .mil A .mil website belongs to an official U.S. Department of Defense organization in the United States ...